<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<script type="text/javascript">
			alert("helloworld")//弹窗
			document.write("helloworld")//打印在页面
			console.log("helloworld")//控制台输出
		</script>
	</head>
	<body>
	</body>
</html>
